| From: | Japin Li <japinli(at)hotmail(dot)com> |
|---|---|
| To: | James Sewell <james(dot)sewell(at)gmail(dot)com> |
| Cc: | pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>, pgsql-hackers(at)lists(dot)postgresql(dot)org |
| Subject: | Re: Virtual tx id |
| Date: | 2022-09-21 04:17:19 |
| Message-ID: | MEYP282MB16690CEDF379EF15F1B0BE20B64F9@MEYP282MB1669.AUSP282.PROD.OUTLOOK.COM |
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| Lists: | pgsql-hackers |
On Wed, 21 Sep 2022 at 11:58, James Sewell <james(dot)sewell(at)gmail(dot)com> wrote:
> Hello Hackers!
>
> Is it possible to get the current virtual txid from C somehow?
>
The virtual txid is consisted of MyProc->backendId and MyProc->lxid. Do you
mean a C function that returns virtual txid?
> I've looked through the code, but can't seem to find anything other than
> getting a NULL when there is no (real) xid assigned. Maybe I'm missing
> something?
>
Do you mean use SQL function to check the virtual? IIRC, there is no such
functions. Maybe you can use pg_export_snapshot() to get virtual txid (v10
and later), the filename of exported snapshot consists MyProc->backendId
and MyProc->lxid.
--
Regrads,
Japin Li.
ChengDu WenWu Information Technology Co.,Ltd.
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